Pet Factsheets

Xray and Ultrasound

Skull: radiographic positioning - lateral oblique
©Glen Cousquer

Veterinary medicine has made many advances in the last 10 years and many local veterinary practices will now be able to perform X-rays and ultrasound examinations.

Why does my vet need to do tests on my rabbit?

Your vet can get a lot of information about what might be wrong with your rabbit from talking to you and examining your rabbit. Sometimes your vet may need to take a blood, urine or faeces sample to test for diseases. X-ray and ultrasound allow your vet to look at the organs inside your rabbits body without having to perform an operation.

How do X-rays work?

X-rays are like light except they can travel through the body. For an X-ray your rabbit will lie under the X-ray machine which sends a beam of X-rays through your rabbit's body onto a photographic plate. When the film is developed your vet will have a picture of the inside of your rabbit. This is called a radiograph.

What is ultrasound?

Veterinary ultrasound machines are just like the ones used by human doctors to scan babies in the womb. As its name suggests ultrasound is a form of sound. Just as sound waves can pass through solid objects (like doors and walls when your neighbour has a party!), ultrasound can pass through the skin into your rabbits body. The sound waves are directed through the area your vet wants to look at and some of them are reflected back like an echo. These echoes are detected by a special computer which uses them to produce a map of the inside of your rabbit which your vet can read.

Will the examination hurt?

No, it is not possible to feel X-rays or ultrasound. For ultrasound examinations fur will need to be shaved over the area where your vet is taking the picture. The ultrasound machine must be in contact with skin to let the sound waves get into the body. The hair should grow back quickly after the examination.

Why does my rabbit have to have an anaesthetic?

Taking an X-ray is a bit like taking a photograph of the inside of your rabbit. For X-ray examinations it is important that your rabbit lies still as the exposure is made or the final picture will be blurred. Nurses and vets take many X-rays every day and so they cannot hold all their patients or they would also be exposed to the X-rays which can be dangerous over a long period of time.

Ultrasound examinations can take up to an hour to perform. Although your pet can be held by a nurse while the vet performs the examination many rabbits do not like to be held still for this length of time. Giving them a sedative makes them relax so that they are not worried by the examination.

Can the test do any damage to my rabbit?

X-rays, when used to produce pictures of your rabbit will not cause side effects. Exposure to high doses, or over long periods of time, can be dangerous and this is why your vet cannot hold your rabbit for the examination. There is no evidence that ultrasound examinations carry any risk at all.

The risk associated with the tests is that of upsetting a sick rabbit or one with breathing difficulties by struggling with it, or the risk of the anaesthetic or sedation in an ill rabbit. Your vet will discuss these risks with you and if you are in any doubt about the risk please ask your vet to explain why they need to do the tests. In almost all cases the risk of not finding out what is wrong with your rabbit, and therefore not being able to treat it, is far worse than the risk of the anaesthetic.

Why do I have to wait for the results of these tests?

Although your vet will be able to see the pictures from these examinations, on the same day that they are taken, they may want to send them to a specialist for a second opinion before giving you a final diagnosis. Some vets specialise only in reading X-rays and ultrasounds and may be less likely to miss information on the pictures. Some veterinary practices now have a specialist in the practice or one who visits the practice regularly to perform these examinations.

Your vet will be happy to explain to you why they need to do tests on your rabbit. If you do not understand the reasons please ask someone to explain the tests to you. If you are interested, your vet will probably be able to show you the pictures of your rabbit after the examination and explain what they can see.

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